Between them they amassed 3-7 of Nire's match-winning tally, with Pat helping himself to a hat-trick of goals a fitting contribution to a magnificent personal performance.
He scarcely looked the veteran of the side as he coolly compiled his impressive tally and, with Shane revelling in his role of both provider and executioner, the brothers all but destroyed the opposition on their own.
Kilmac's expected vibrant challenge never materialised and, while their eventual margin of defeat may have been a trifle hard on them, they were always playing second fiddle to a side that looks well capable of going one better than last year's county final defeat.
The losers enjoyed the luxury of the lead just once, and fleetingly.
Miceal Downey's excellent point inside the opening minute gave them the most encouraging of starts but soon they were playing catch-up and never had a realistic chance of succeeding.
Shane Walsh had the Nire level by the third minute and when Pat Walsh delivered the first of his goals two minutes later they took a lead they never again relinquished.
Kilmac did threaten briefly to get back into contention with well taken points from two of their better players, Paudie Prendergast and Pa Behan, but things were already looking ominous for them when they trailed by 1-5 to 0-4 at the interval.
It took the Nire just six second-half minutes to sign, seal, and deliver their victory.
Within 30 seconds Walsh had his second goal. He was perfectly positioned to gather the ball after Tom Flynn's effort clattered off the crossbar and gave goalkeeper Ned Power no chance from close range.
Shane Walsh, Anthony O'Gorman (a hugely impressive debutant) and substitute Liam Lawlor tacked on points as the Nire hit top gear and it was all over as a meaningful contest in the 36th minute when Walsh completed his hat-trick thanks to a pass of pinpoint accuracy from brother Shane.
Kilmac responded with points from Miceal Downey and Prendergast but the effort was little more than token and, with the minimum of fuss and effort, the Nire wrapped up their victory with half a dozen more points to which Prendergast's one in the 48th minute was Kilmac's solitary reply.
Scorers: Nire P. Walsh (3-3); S. Walsh (0-4); C. Power (0-2); A. O'Gorman (0-2); J. Moore, T. Flynn, L. Lawlor (0-1) each. Kilmacthomas P. Prendergast (0-4); M. Downey (0-2); P. Behan (0-1).
Nire: M. Doocey; I. Walsh, D. Ryan, M. Byrne; J.Walsh, B. Wall, D. Prendergast; A. Ryan, A. O'Gorman; J. Moore, C. Power, M.Walsh; P. Walsh, S. Walsh, T. Flynn; Subs; L. Lawlor for A. Ryan; J. Whelan for Byrne; D. Spellman for M.Walsh.
Kilmacthomas; N. Power; M. Hallahan, B. Whelan, J. Long; P. Mulhearne, P. Reilly, D. Power; D. Power, P. Behan; J.Joy, P. Prendergast, C. Downey; D. Phelan, M.Downey, J. Power; Sub; D. O'Brien for Long.
Referee; Pat Moore, Ballinacourty.